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I @Quinn tstrs @anni @Hirn ALEXANDER C. MARTIN AND JOSEPH WO ODROUGH, OF HAMLTON, OHIO.

I Letters Patent No. 61,014, dated January 8, 1867.'

IMPRUVEMENT Ill SAWS.

@he Srlgemle metten tn im time eter rtmt :mh mating part uf its stmt.

T0 ALL WHOM IT MAY CONGERN:

Be it known that we, ALEXANDER C. MARTIN and JOSEPH Woonnouen, of Hamilton, in Butler county, in'

the State of Ohio, have invented a new and useful Improvement 'in Saws; and we do hereby declare that the following is a full and exact description thereof, reference being had to the accompanying drawings, and to the letters of reference marked. thereon. Y

The drawing represents a. circuler sew with our improvement attached,

Our invention consists in introducing a saw-tooth into an opening in Athe plate of the sew larger than the base or shank of the tooth, und securing the tooth therein by adjusting it towards the periphery or edge of the sow, end inserting a sepa-rete plate or piece of metal in the opening at the base of .the tooth-shank, as willbe herein more fully described. l

n the accompanying drawing, A denotes a. circularsaw plate; B is the removable saw tooth; C a plate of met-nl and D is a. pin inserted at the end of the plate C. The tooth-shank, plete C, and pin D, .are ofA equal thickness with the saw plete A, and the engularly formed opening into which the tooth-shank is inserted is of a. size end form corresponding with the space occupied by the shank, metal plate, a.nd pin. The form of lthis opening in tho periphery or edge of a saw plate may, however, be vnried es indicated in dotted lines at B', als

in that case the tooth would be inserted and secured in its proper place by moving, or adjusting it, from the direction of the centre towards the periphery or edge of the saw plate. The edges of the tooth-shank which rest against the edge of the saw plate, at the sides of the opening, are provided with a V-sl;ia.ped groove to t upon n corresponding V-slm-ped sent which is the edge of the plate; this, however, is no part of our present invention, The book of the tooth at E is curved outwardly and rests against the curved projecting portion of the scw-plnte E. This curved back of the tooth may be dispensed with, and it and the backing may be mede plain as indicated in the dotted line E. The object of either the curved or straight back and backing of the tooth is to receive the force or pressure when the saw is in use, and to relieve the seat at the base of the toothshank from undue pressure, as well as to nvod lany tendency of the tooth being nnseated when in operation. It will be observed that our improvement is equally well `dsp-ted to the reciprocating or straight saw as to the circuler saw. The saw plate is formed with a. series of curved or angular openings or depressions as represented, the Width of which is less at the periphery than at any point towards its base, that is to say, the spaces or openings in which the teeth are inserted widen es they extend towards the centre of the saw, and the teeth-Shanks being oi"I a, corresponding form (but of less depth) cannot be unseatedby the centrifugal action of the saw when in use. The teeth-Shanks being grooved cs described to dt over the angular-shaped edges of the plate at the sides of the opening, it will be seen that the opening 4must be deeper than the tooth-shank from its curved portion to its base. The teeth being thus inserted, by moving them outward, will leave a. space to be filled at their base by a strip of metal. The plate or strip C, and pin D, or either of them, will be suicient to retain the teeth in place. When one tooth or set of teeth is worn out or broken others may be readily inserted in their place. .l l

Having fully described the manner of constructing and using our improvements in saws, what we claim, and desire to secure by Letters Patent, is

Inserting the saw tooth in its seat, by moving it towards the periphery or edge of the saw, and securing it in place by themoans substantially as specified.

In testimony whereof we have hereunto set our hands this 29th August, 1866.

' A. C. 'MARTEL c JOSEPH WOODROUGH.

Witnesses:

H. P. K. Prox, NELSON Gn'rxs. 

